Uninterruptable power supply



FIG. 1 is a perspective view of an uninterruptible power supply, showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof; the left side elevation view is a mirror image thereto;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken line showing of the environment is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for an uninterruptable power supply, as shown and described. 